Hi Georg,
I have spent a considerable amount of time in the past for finding the "right" host for me.
As Ray has written, it should not matter since it is only a Euro per week. And that is indeed right. But if I may, I'll address a couple of issues I've come accross myself.
Firstly, TANSTAFL (there ain't no such thing as free lunch). In other words, none of the hosts promising "unlimited" storage and bandwith for just 5 $ a month can actually deliver it. Your hosting plan states an incredible 110 GB. You can be sure that once you've filled up some 15% of it, you'll get a mail from your host. If your data keeps on growing, they will try and sell you an upgrade account on a less populated server somewhere else. If you do not comply, they'll start moving your account between servers, the IP numbers will change and you'll go crazy since every change will mean a distruption to the accessibility for at least 48 hours till the DNS propogation takes place globally. The same story for the bandwith. Actually, almost all hosts have to have some small print in their terms of service somewhere stating that abusing the available system bandwith is prone to unilateral termination of your account with them. Usually, continous utilization of more than 25% of the available resources of the server your account is hosted on is a breach of their ToS. However, any regular web site, even the very popular ones, never get anywhere near a BW in the order of a TB let alone a GB, unless you let people download and upload thousands of high resolution images. So this should be no problem in your case. The moral of this story is that it may be sometimes better considering hosts that have severe BW and storage restrictions, but realistic ones backed up by a quality of service guarantee. It is much more important to know that:
- your host does not allow spammers or porn sites as clients, so that your server IP won't possibly get blocked by a DNSBL (blocklist servers).
- your server will not be overloaded by 100s of other sites, which may then even be retail accounts selling virtual hosting to sub-accounts.
- your host has a proven uptime reputation, servers are fast and responsive
- there is good customer support and also an active and friendly user forum which is not censored by the host.
In short, if you can find a host that can deliver these as a guarantee, go for it even if you have to pay the double amount. You'll be much happier on the long run, believe me

.
Cheers,
PS: I am also a happy customer of site5.com for two years right now. Not entirely w/o problems I must admit, but s**t happens everywhere and site5 staff has always been very helpful in sorting out the issues quickly and effectively.